Contagious diseases (such as the flu, colds, or strep throat)is said to spread from person to person in several ways. One way is through direct physical contact, like touching or kissing a person who has the infection. Another way is when an infectious microbe travels through the air after someone nearby sneezes or coughs.

It is said that some people get contagious diseases by touching or using something an infected person has touched or used " like sharing a straw with someone who has mono or stepping into the shower after someone who has athlete's foot. And sexually transmitted diseases (STDs) are spread through all types of sex " oral, anal, or vaginal.